AirHint found the following cheapest return flights from Sydney (SYD) to Kathmandu (KTM) in December 2025 (see full year).

Return flights

28 Dec - 11 Jan	AirAsia X
23 Dec - 30 Dec	AirAsia X
28 Dec - 06 Jan	Scoot
22 Dec - 29 Dec	AirAsia X
24 Dec - 31 Jan	AirAsia X
24 Dec - 19 Jan	AirAsia X
25 Dec - 01 Jan	AirAsia X
21 Dec - 26 Jan	Batik Air Malaysia
23 Dec - 26 Jan	Batik Air Malaysia
23 Dec - 07 Jan	AirAsia X
31 Dec - 31 Jan	Singapore Airlines
31 Dec - 07 Jan	Singapore Airlines
19 Dec - 20 Dec	Qantas
19 Dec - 21 Dec	Qantas
19 Dec - 22 Dec	Qantas
21 Dec - 24 Dec	China Southern
22 Dec - 28 Dec	China Southern
19 Dec - 24 Dec	China Southern
23 Dec - 24 Dec	Thai Airways

Also check the deals for one-way flights from Sydney to Kathmandu in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Sydney to Kathmandu in December from 926€

Return flights